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LTC2951CDDB-2 Datasheet(PDF) 3 Page - Linear Technology |
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LTC2951CDDB-2 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page LTC2951-1/LTC2951-2 3 295112fa The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 2.7V to 26.4V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Push Button Pin (⎯P⎯B) V⎯P⎯B(MIN, MAX) ⎯P⎯B Voltage Range Single-Ended ● –1 26.4 V I⎯P⎯B ⎯P⎯B Input Current 2.5V < V⎯P⎯B < 26.4V V⎯P⎯B = 1V V⎯P⎯B = 0.6V ● ● ● –1 –3 –6 –9 ±1 –12 –15 µA µA µA V⎯P⎯B(VTH) ⎯P⎯B Input Threshold ⎯P⎯B Falling ● 0.6 0.8 1 V V⎯P⎯B(VOC) ⎯P⎯B Open Circuit Voltage I⎯P⎯B = –1µA ● 11.62 V Timing Pins (KILLT, OFFT) IKILLT, OFFT(PU) KILLT/OFFT Pull Up Current VKILLT, OFFT = 0V ● –2.4 –3 –3.6 µA IKILLT, OFFT(PD) KILLT/OFFT Pull Down Current VKILLT, OFFT = 1.3V ● 2.4 3 3.6 µA tDB, ON Turn On Debounce Time ⎯P⎯B Falling → Enable Asserted ● 100 128 163 ms tDB, OFF Internal Turn Off Debounce Time OFFT Pin Float, ⎯P⎯B Falling → ⎯I⎯N⎯T Falling ● 26 32 41 ms tOFFT Additional Adjustable Turn Off Time COFFT = 1500pF ● 9 11.5 13.5 ms µP Handshake Pins (⎯I⎯N⎯T, ⎯K⎯I⎯L⎯L) I⎯I⎯N⎯T(LKG) ⎯I⎯N⎯T Leakage Current V⎯⎯⎯I⎯N⎯T = 3V ● ±1 µA V⎯I⎯N⎯T(VOL) ⎯I⎯N⎯T Output Voltage Low I⎯⎯⎯I⎯N⎯T = 3mA ● 0.11 0.4 V V⎯K⎯I⎯L⎯L(TH) ⎯K⎯I⎯L⎯L Input Threshold Voltage ⎯K⎯I⎯L⎯L Falling ● 0.57 0.6 0.63 V V⎯K⎯I⎯L⎯L(HYST) ⎯K⎯I⎯L⎯L Input Threshold Hysteresis ● 10 30 50 mV I⎯K⎯I⎯L⎯L(LKG) ⎯K⎯I⎯L⎯L Leakage Current V⎯K⎯I⎯L⎯L = 0.6V ● ±0.1 µA t⎯K⎯I⎯L⎯L(PW) ⎯K⎯I⎯L⎯L Minimum Pulse Width ● 30 µs t⎯K⎯I⎯L⎯L(PD) ⎯K⎯I⎯L⎯L Propagation Delay ⎯K⎯I⎯L⎯L Falling → Enable Released ● 30 µs t⎯K⎯I⎯L⎯L, ON BLANK ⎯K⎯I⎯L⎯L Turn On Blanking (Note 3) ⎯K⎯I⎯L⎯L = Low, Enable Asserted → Enable Released ● 400 512 650 ms t⎯K⎯I⎯L⎯L, OFF DELAY Internal ⎯K⎯I⎯L⎯L Turn Off Delay (Note 4) KILLT Pin Float, ⎯K⎯I⎯L⎯L = High, ⎯⎯I⎯⎯⎯N⎯⎯⎯T Asserted → Enable Released ● 100 128 163 ms t⎯K⎯I⎯L⎯L, OFF DELAY, ADDITIONAL Additional Adjustable ⎯K⎯I⎯L⎯L Turn Off Delay (Note 4) CKILLT = 1500pF ● 9 11.5 13.5 ms tEN/⎯E⎯N, Lock Out EN/⎯E⎯N Lock Out Time (Note 5) Enable Released → Enable Asserted ● 200 256 325 ms IEN/⎯E⎯N(LKG) EN/⎯E⎯N Leakage Current VEN/⎯E⎯N = 1V, Sink Current Off ● ±0.1 µA VEN/⎯E⎯N(VOL) EN/⎯E⎯N Voltage Output Low IEN/⎯E⎯N = 3mA ● 0.11 0.4 V Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All currents into pins are positive; all voltages are referenced to GND unless otherwise noted. Note 3: The ⎯K⎯I⎯L⎯L turn on blanking timer period is the waiting period immediately after the enable output is asserted. This blanking time allows sufficient time for the DC/DC converter and the µP to perform power up tasks. The ⎯K⎯I⎯L⎯L and ⎯P⎯B inputs are ignored during this period. If ⎯K⎯I⎯L⎯L remains low at the end of this time period, the enable output is released, thus turning off system power. This time delay does not include tDB, ON. Note 4: The internal ⎯K⎯I⎯L⎯L turn off delay (t⎯K⎯I⎯L⎯L, OFF DELAY) is the default delay from the initiation of a power off sequence (⎯I⎯N⎯T falling, ⎯K⎯I⎯L⎯L = high), to the release of the enable output. The additional, adjustable ⎯K⎯I⎯L⎯L turn off delay (t⎯K⎯I⎯L⎯L, OFF DELAY, ADDITIONAL) uses an optional external capacitor (CKILLT) to provide extra delay from ⎯I⎯N⎯T falling to the release of the enable output. If the ⎯K⎯I⎯L⎯L input switches low at any time during ⎯K⎯I⎯L⎯L turn off delay, enable is released, thus turning off system power. Note 5: The enable lock out time is designed to allow an application to properly power down such that the next power up sequence starts from a consistent powered down configuration. ⎯P⎯B is ignored during this lock out time. This time delay does not include tDB, ON. ELECTRICAL CHARACTERISTICS |
Similar Part No. - LTC2951CDDB-2 |
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Similar Description - LTC2951CDDB-2 |
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